Patent US2502171A successfully refreshed from Google Patents.
US2611280A
Expired / Lapsed
US
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Screw feed mechanism
Assignee: Individual
•
Filing: 1948-07-03
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Granted: 1952-09-23
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Expires: 1968-07-03
Abstract
No abstract record available.
Inventors
- 👤 William A Brinkhurst
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:48
CPC Classifications
F; F16; F16H; F16H25/00; F16H25/18; F16H25/20; F16H25/2025; E; E21; E21B; E21B19/00; E21B19/08; E21B19/081; F16H25/22; F16H25/2247; F16H25/2266; Y; Y10; Y10T; Y10T74/00; Y10T74/19; Y10T74/19642; Y10T74/19698; Y10T74/19702; Y10T74/19721; Y10T74/19744; Y10T74/19781; Y10T74/19791; Y10T74/19795; Y10T82/00; Y10T82/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-09-23 | 1956-03-24 | 1956-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-09-23 | 1960-03-24 | 1960-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-09-23 | 1964-03-24 | 1964-09-23 | $7700.00 | Window Closed / Lapsed |